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Controlling a Stepper Motor Bidirectionally

Publishing Venue

IBM

Related People

Kline, ND: AUTHOR

Abstract

This is a system for controlling a stepper motor bidirectionally, including a control ring advanced by a sequence of pulses to operate the motor in one direction and advanced by the same sequence of pulses but with some of the pulses being at a faster rate, so that the ring advances through certain stages without the motor being responsive thereto and thereby advances the motor in the opposite direction.

Country

United States

Language

English (United States)

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Controlling a Stepper Motor Bidirectionally

This is a system for controlling a stepper motor bidirectionally, including a
control ring advanced by a sequence of pulses to operate the motor in one
direction and advanced by the same sequence of pulses but with some of the
pulses being at a faster rate, so that the ring advances through certain stages
without the motor being responsive thereto and thereby advances the motor in
the opposite direction.

Stored program controller 10 such as a digital computer, Fig. 1 initially resets
triggers 15 and 20 of ring 25. The set outputs of triggers 15 and 20 are
connected to drivers 16 and 21, respectively. The set outputs of triggers 15 and
20 are also connected to inverters 17 and 22, respectively. The outputs of
inverters 17 and 22 are connected to drivers 18 and 23, respectively. Drivers 16,
18, 21 and 23 are connected to energize windings 31, 32, 33 and 34,
respectively, of stepper motor 30.

Computer 10 would be programmed whereby a counter, Fig. 2, is set to four.
The counter is then decremented by one. Computer 10 then tests to see if the
motor is to step forward or backward. If the motor is being stepped forward, ring
25 is stepped and computer 10 provides a timeout period of 35 milliseconds. If
the counter is not at zero, then the counter is again decremented by one and ring
25 is advanced. The timeout period of 35 milliseconds is again provided by the
computer and the operation continues until the counter equals 0. T...